According to reports, Charles chose the nickname for Meghan because, like the metal, she is “strong and unbending.”

"Prince Charles admires Meghan for her strength and the backbone she gives Harry, who needs a tungsten-type figure in his life as he can be a bit of a softy," a source told the Daily Mail. "It's become a term of endearment.”

As Daily Mail added, Meghan further expressed her gratitude for Prince Charles at her wedding reception, thanking him for being so welcoming to both her and her mother, Doria.

In a separate story, the Daily Mail reported that Meghan returned the familial favor by healing the bond between her husband, Harry, and his father.

“Meghan met Charles and was bowled over by his charm,” a source close to the family noted. “She told Harry he was wonderful: welcoming, warm, hard-working, kind, and stable. She made it clear that he should appreciate him and bond more.”

In return, Charles reportedly told a friend he thinks Meghan is “so intelligent and so nice. She makes Harry happy. We could not like her more.”

Of course, Charles isn’t the only member of the family Meghan is close to. In recent weeks, Meghan has gone on one-on-one outings with Queen Elizabeth II to Cheshire, where they were spotted giggling like school girls, and just a few days ago she attended Wimbledon with her sister-in-law Kate Middleton. There, the pair were spotted laughing together and looking equally stylish. No word yet on which member of the royal family is Meghan’s favorite, but we’ll place bets on it being Harry. (Sorry, Charles.)